Can I use the GC to find the number and type of each java object?

Mon May 10 18:02:00 GMT 2004

I occasionally run out of memory when running GCJ compiled code, and in 
the interests of understanding what is happening, I would like to be 
able to dump the type, size and occurrence count of each reachable object.
It there a predefined method, or lacking that a good place to hook in to 
boehm-gc to find information about all reachable objects?
David Daney.